Descartes concluded that a person, including himself, was composed of two radically different substances, a material substance that can be understood with the senses and another that consisted of:

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Descartes' philosophy is centered around the concept of dualism, which posits that reality consists of two fundamental substances: the material (or physical) and the mental. He famously concluded that the essence of the mind is thought, distinct from the material body, leading to his conclusion that the thinking mind is a separate substance.

Descartes Concluded That a Person, Including Himself, Was Composed of Two